Combination band pulling and punching tool



March 2, 1943. l E. J. GOVANUS 2,312,400

COMBINATION BAND PULLING AND PUNCHING TOOL Filed Feb. 8, 1941 PatentedMar. 2, 1943 COMBINATION BAND PULLING AND PUNCHING TOOL Eimer J.Govanus, Chicago, Ill., assignor `to Punch-Lok Company, Chicago, Ill.,a. corporation of Illinois Application February 8, 1941, Serial No.378,118

6 Claims.

This invention is in the nature of a manually operated tool for pullingand tensioning a metal band and locking it in its tensioned condition toor on an object with which it is engaged. For example, it is commonpractice to bond together the boards or slats forming the walls ofwooden crates by flexible metal bands or straps passed around and nailedto the walls of the crate, in which case the hands or straps should bedrawn as tightly as possible around the crate walls to secure the bestbonding effect. Again, it is known practice to tighten a rubber hose onan inserted nipple or coupling by coiling a flat soft` metal band aroundthe portion of the hose surrounding the nipple or coupling and drawingthe coils tightly together and locking them against re-expansion. A hoseclamp of this character forms the subject matter of an application forLetters Patent Filed January 29, 1940 by Charles H. McKee, Serial No.316,100, and owned by the assignee of the present invention. In thearticle of this McKee application, the coils of the band making up theclamp are encircled transversely by a collar to the inner limb of whichis anchored the innermost coil of the clamp, and, by means of a punchand a hammer or mallet for driving the punch, a lug is offset from theouter limb of the collar into the outer coil of the tightened clamp, thesame blow on the punch at the same time offsetting lugs from the outercoil into an intermediate coil or coils, and from the latter into theinnermost coil and the inner limb of the collar so that by theinternested lugs the coils of the clamp are securely locked againstreexpanding.

The tool of my present invention has been designed more particularly,although not exclusively, for use in both tightening and locking thehose clamp of the aforesaid McKee application; and its main contributionto the known art consists in combining with a band pulling or tensioningtool, by which the coils of the clamp are tightened on each other, apunch head and punch mounted on the forward end of the band pulling ortensioning tool that, when the hose clamp has been fully tightened, willdirectly overlie the collar of the clamp, and, when struck by a. hammeror mallet, will lock the collar and coils of the clamp to each other inthe manner above described, against re-expanding. This improvementsubstantially facilitates the work of tightening and locking the clamp,and saves time, because it can readily be accomplished by one workman,whereas the former method required two,-one to operate the band pullingand tensioning tool, and the other to correctly position and drive thepunch.

A further improvement, forming an optional part of my present invention,consists of an adapter by which the tool may be converted from aportable tool to a bench type tool that facilitates its operation,insures the correct application of the tool to the work, and saves time.This adapter consists of a tool supporting and positioning plate that isattached by screws or otherwise to the bench and is equipped at one endwith means for pivotally mounting the rear end of the tool thereon andat its other end with an anvil to position and seat the coiled clamp orother portion of the band to be punched directly beneath the punch.

A practical and approved embodiment of the present invention isillustrated in the accompanying drawing, in which- Fig. 1 is a sideelevation showing the tool and work mounted on an adapter, with the handlever thrown upwardly and forwardly and the punch head and punch inelevated position.

Fig. 2 is a vertical longitudinal section through the tool, work andadapter shown in Fig. 1, and showing the band gripping dog in raisedposition to allow the passage therebeneath of the portion of the band tobe gripped by the dog.

Fig. 3 is a similar longitudinal section showing the hand lever lowered,the dog engaged with the band and exerting a pull on the latter, and thepusher nose of the tool in thrust engagement with the top member of theclamp collar, and the tool ready for the punching operation.

Fig. 4 is a view similar to Fig. 3, illustrating the locking eil'ect onthe hose clamp caused by a hammer blow on the punch head.

Fig. 5 is a transverse vertical section taken on the line 5--5 of Fig.4.

In the drawing I have shown the tool applied to the tightening andlocking of a hose clamp, such as forms the subject matter of theaforesaid McKee application. Briefly describing this hoseclamp, Adesignates the hose and B a metal nipple or hose coupling inserted inthe hose. The clamp is made from a length of a pliable metal band. Oneportion of this band is wound on itself to form a two-ply ring C ofslightly larger diameter than the hose A to which it is applied. Theplies or coils of the ring C include outer and inner lapped end portionswith the intermediate ply or coil lying between them. From a section ofthe same band there is formed a rectangular collar D that transverselyembraces the lapped end portions and the intermediate coil. The lappedend of the inner coil is bent backwardly on itself forming a hook E thatanchors the inner coil to the inner limb of lthe collar D which itembraces, and continuous With the outer coil is a straight tangentialextension F, that passes under the outer limb of the collar, and isengaged by. the pulling and punching tool.

In order that my present improvements may be clearly understood, I willfirst describe the main structural features of that portion of the toolwhich effects the pulling and tensioning of the band. i

The body member or frame comprises a round straight member I and acasting II into the lower portion of which the inner end of member I0 istightly driven. The upper portion of this casting is of channel shape incross section, and the iiat top surface of the lower solid portion formsin part a slideway for the portion of the band inserted into the tool.Pivoted on a cross pin I2 mounted in and between the side walls of thechannel casting II is a yoke I3, and between the arms of said yoke andalso pivoted on the pin I2 is a pusher nose I 4, the lower front edge ofwhich abuts against the upper limb of the collar D of the hose clampwhen the band is being tensloned.

Slidable on the body member I0 is a puller housing I5 the upper portionof which is longitudinally channeled, and pivoted ona cross pinI6`within the channel is the forked upper portion of a dog I1 havingband gripping teeth I1 on its lower surface. The dog is normally heldinits working position (Figs. 3 and 4) by a thrust spring I8 encircling ashort lever arm `I9 the lower end of which is articulated in the dog,and the upper end of which is coiled at 20 around a fulcrum pin 2I inthe upper rear portion of the puller housing I5, and continuous with thecoils is a rearwardly extending loop-shaped lever arm 22, by depressingwhich by the thumb or palm of the operators-hand the dog may be raised.,The spring I8 is conned between upper and lower washers 23 and 24loosely mounted on the lever arm I9.

A hand lever, by which a pull on the band is exerted through the dog,comprises a straight `round bar or rod 25 equipped with a knob 26 on itsfree end, its other end being tightly tted into the solid portion of aforked casting 21 that is pivoted on a cross pin 28 mounted in andbetween the sides of the upper forked vportion of the casting I I .y Alink 29 mounted at one end on a pin 30 extending acrossV the fork of thecasting 21 and' at its other end on the pin I6 between the limbs of thefork of the dog I1 transmits movement in both directions from hand leverto the puller housing I5 `along the body member I0. The top surface ofthe lower porf tion of the puller housing I5 is at and is alined with,and forms in ei'ect a continuation of, the top flat surface of thecasting II for the purpose of providing a support and slideway for theband.

Between the top of the pusher nose I4 and the transverse top limb of theyoke I3 is a thrust spring 3| that normally maintains the front end 4ofthev pusher nose lowered, closing the frontv 55, housing I 5 forwardly,and the latter, striking the of thev hand lever is formed with 1 and 2,strikes a tail 33 on the pusher nose I4 and thus tilts the forward endof the latter upwardly, as shown in Fig. 2, sutliciently to permitentrance of the band extension F therebeneath, to the slideway. When thehand lever is lowered, the spring 3| holds the front end of the pushernose in thrust engagement with the collar of the hose clamp, as shown inFigs. 3 and 4.

The band tensioning tool as thus rfar described, is a known commercialarticle, and no claim to the same, per se, is made herein. A

Coming now to a description of my presen improvements, 34 designates apunch head cast with a pair of rearwardly extending arms 35 thatstraddle the upper channeled portion of the casting II and are pivotallysupported on the ends of thev transverse pin 23. The punch head 34overhangs the front end of the band pulling and tensioning tool abovedescribed and is formed in its lower portion with 'a vertical socket 38into which is fitted a hardened steel pointed punch 31. In the frontwall of the head 34 is a tapped hole that receives a set screw 38 tohold the punch in the head; and throughtthe top of the head is a smallerhole 39 to receive a tool for dislodging a worn punch from the socketafter the set screw 33 has been backed off. As will be readilyseen, thepoint of the punch 31 directly overlies the center of the outertransverse limb of the hose clamp collar D, and whenA the'hand lever isin its lowered position the point of the punch restson the clamp collar,as shown in Fig. 3. The lower rear endsof the Varms35 of the punch headare slightly extended rearwardly in the form of lugs 40 that whenthehandv lever is thrown upwardly and forwardly, vas shown in Figs. 1and 2, are struck by the forward end of the puller housing VI5`so as tovswing the punch head and punch upwardly to the positionshown in Figs. land 2, to facilitate the insertionI of the tangential band extension Finto the tool, ,at which timethe operating lever of the dog I1 ismanipulated to raise the dog above the path of the band extension.V i

The tool as thus far described is complete as `a portable hand tool, andits operation as an pressing the rear end of the dog raising lever bythe thumb or palm of the same hand, and he then with the other handthrows hand lever rod 25 to the upward and forward position shown inFigs. 1 and 2. This` operation draws the puller lugs 40 tilts the punchhead and punch upwardly out of the way of the entrance end of the bandslideway. At the same time, the hand lever casting 21, through thecooperating lugs 32 and 3l, tilts the pusherA nose I4 upwardly out ofthe way of the tangential band extension F.v The band extension F isthen inserted to `a point where it passes beneath and beyond the dog I1.The dog lever arm 22 is then raisedlowering the dog onto the band, andthe hand lever 25 is swung rearwardly and downwardly. This,'through thelink 29 forces the puller housing I5 and the dog rearwardly, creating arearward pull on the band and thus tightening the coils of the hoseclamp on each other. This manipulation of the hand lever 25 may berepeatedvseveral times if necessaryyto. fully` tightenthe coils of thehose clamp.

, The backward movement of the puller housing I5 allows the punch headto drop'with the point of the punch resting directly on the upper limbof the clamp collar D. With a hammer or mallet the operator then strikesthe punch head, and the point of the punch offsets a series of lugs fromthe upper limb of the clamp collar and the underlying coils intointernested relation with each other, as shown in Fig. 4, whicheiectively locks the coils against re-expansion. With the locked coiland hose in one hand and the tool in the other, the operator then givesthe clamp and the tool an up and down see-saw motion which breaks theband at the pusher nose of the tool; and then, by elevating the dog, thewaste strip E may be pulled out and discarded.

'I'he adapter` device for converting the portable too1 into a bench typetool comprises, as herein shown, a flat rectangular plate 4|, ofslightly greater length than that of the tool, on the rear end of whichplate aresecured, as by screws 42, a pair of opposed mating brackets 43,integral with the upper ends of which brackets are axially alinedbearings 44,. said bearings being adapted to receive the end portion ofa trunnion bar 45 that is mounted on and crosswise of the rear end ofthe body member l of the tool, whereby the latter can be swung up anddown vertically. The two brackets 43 are centrally united by a clampbolt 46 and wing nut 41. Mounted on the other end oi' the plate 4I is ananvil member designed to accurately position and support the work, suchas the metal clamping ringl C. This anvil member, as herein shown,comprises a solid block 48 cast with base flanges 49 on its oppositesides, each of these flanges being formed with a longitudinal slot 50through which extends a fastening screw 5| entering a tapped hole 52 inthe plate 4I. This means for fastening the anvil to the plate permits alimited adjustment of the anvil lengthwise of the plate to accommodatetools of different lengths. Where the anvil is intended to center andseat a round object, such as the hose clamp C, its upper surface ispreferably formed with a shallow V- shaped notch 53, as herein shown.

The use of this adapter considerably facilitates the accurateapplication of the tool to the work, and it also prevents the necessityof the workman finding an adequate support for the work to be punchedbefore eiecting the punching by a hammer blow on the punch head.However, the band pulling and punching tool is entirely operable,independently of the presence or absence of this adapter.

Minor variations and modifications in the structural details of theinvention herein illustrated and described may be resorted to within thescope and coverage of the claims.

I claimt:

l. In a portable tool for tensioning a metal band and locking it intensioned condition, the combination with a body member equipped with alongitudinal band slideway open at the front end of said body member forthe insertion of the band, a band grip, and means for moving said griplengthwise of said slideway to tension the band, of a punch head pivotedon and overhanging the front end of said body member and in its fullylowered position covering the entrance end of said slideway, a pointedpunch mounted in said head adapted to offset a lugrom the tensioned bandinto an anchorage member under a hammer blow on said head, and a memberslidable on said body member operative, through contact with said head,to raise the latter suiliclently to uncover the entrance end of saidslideway for the insertion of the band.

2. In a portable tool for tensioning a metal band and locking it intensioned condition, the combination with a body member equipped with alongitudinal band slideway open at the front end of said body member forthe insertion of the band, a puller housing slidable on said bodymember, a band gripping dog pivoted on said housing, a punch headpivotally mounted on and overhanging the front end of said body memberand in its fully loweredpposition covering the entrance end of saidslideway, a pointed punch mounted in said head, a hand lever pivoted onthe forward end of said body member, and a link connecting said handlever to said puller housing through which, when said hand lever isswung upwardly, said puller housing through contact with said punch headraises the latter suilciently to uncover the entrance end of saidslideway.

3. An embodiment of the subject-matter defined in claim 2, wherein thepunch head is formed with a pair of rearwardly extending arms pivoted onthe forward end of the body member, and the lower rear ends of said armsare contacted by the puller housing to raise the punch head.

4. In a portable tool for tightening coils of a metal band on each otherand locking them against expansion, the combination of a body memberequipped with means for gripping a straight portion of the bandextending tangentially of the outer coil and with means for exerting apull, through said gripping means, on said tangential portion to therebytighten the coils on each other, a punch head pivotally mounted on andoverhanging the forward end of said body member and carrying a punchadapted to overlie the outermost coil and to offset portions of saidcoils into each other under a hammer blow on said head, and means forconverting said tool from a portable too1 to a bench type tool,comprising a flat plate adapted to be secured on a bench, means forpivotally mounting the rear end of the tool on one end of said plate,and an anvil on the other end of said plate formed in its upper sidewith a V-shaped notch to position and seat the coiled portion of theband directly beneath the punch.

5. In a tool for tensioning a metal band and locking it in tensionedcondition, the combination with a, body member equipped with a band gripand means for moving said grip lengthwise of said body member to tensionthe band, of a punch head pivoted on and overhanging the forward end ofsaid body member and carrying a punch adapted to oiset a lug from thetensioned band into an anchorage member under a hammer blow on saidhead, and means for converting said tool from a portable too1 to a benchtype tool, comprising a flat plate adapted to be secured on a bench,means for pivotally mounting the rear end of said tool on one end ofsaid plate, and an anvil on the other end of said plate to support theportion of the band operated on by said punch.

6. A tool for tensioning and locking a metal band around an article, theband comprising a strap coiled around the article with one end portionof the strap extended into overlapping relation to the other end portionthereof, and a sealing element initially disposed adjacent one end ofthe strap and anchored thereto to prevent displacement of the sealingelement by movement thereof longitudinally of the strap off said endthereof, the tool comprising a member for receiving a portion of saidstrap and a. means for engaging the sealing element thereon to hold thesame and the adjacent end portion of the band in substantially xedpositionv relative to the tool, means movably supported on said `memberfor gripping the other end portion of the band, means for moving saidgripping means relative to said member in a direction to ten- 10 sionthe band around the article, a punch mounted on the tool so as to bemovable in a predetermined path of travel relative to said member andtransversely of the normal plane of the sealing element, said punchbeing adapted to be driven into said sealing element and the overlappedportions of the tensioned band to produce interlocking offsets therein,whereby the vband is locked in tensioned condition.

EINER J. GOVANUS.

